What a surprising problem. If the boss mistakenly accuses you of watching porn - why not explain why they're wrong and show them the site? If they won't accept that, then it means you're in danger with any web surfing you do at work and should already not be clicking random links. It's not the site's fault, it's your company's fault and your own for not protecting yourself against breaking their rules.
Personally, the idea that there's a network my traffic flows over, where that traffic is sniffed such that its content could potentially result in things like me losing my job, is just debilitating to me.
If I worked for such a company, all my traffic would be flowing over a VPN, full-stop.
Pretty standard in any reasonably secure financial services org.
All direct Internet access is blocked and prohibited, with all attempts to access the Internet (tcp/80, tcp/443) transparently proxied via Bluecoat/Websense/Forcepoint/etc proxies, which filter based on URL categorisation. WSS generally doesn't work in this kind of environment. Everything else is dropped.
Any attempts to bypass filtering is a violation of IT policy and is sackable. Visiting sites that are blocked gets logged, doesn't generally get flagged up unless is a daily occurrence, and the first assumption is usually malware.
Source: Worked for several such companies, was responsible for perimeter security in some.
